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in a word: acceleration.

Acceleration is a red herring. Yes, logically a lower mass diaphragm is more easily accelerated than one with more mass. That would be a concern if the electromotive force of a voice coil or electrostatic grids operated with the realm of the speed of sound. But they don't. They operate within the realm of the speed of light. Making a diaphragm vibrate at 20kHz over a distance of less than a millimeter is no chore for an electron wave that travels some 270,000 km/s.

One advantage of the low mass of an electrostat diaphragm is it stores less kinetic energy to be released in the form of distortion. The large surface area reduces the excursion required to reach a given SPL, also reducing distortion. Shorter excursion to reach a given SPL also results in lower acceleration, as the diaphragm doesn't have to move as far within the same time frame, so even if acceleration mattered there's less need for it with an electrostatic.

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